Physics · 2016
NEET 2016 · 1 May · Code Y · Q105
When a metallic surface is illuminated with radiation of wavelength λ, the stopping potential is V. If the same surface is illuminated with radiation…
When a metallic surface is illuminated with radiation of wavelength $\displaystyle \lambda$, the stopping potential is V. If the same surface is illuminated with radiation of wavelength $\displaystyle 2 \lambda$, the stopping potential is $\displaystyle \frac{\mathrm{V}}{4}$. The threshold wavelength for the metallic surface is :
Official answer
From NTA’s final answer key for this paper.
(1)
$\displaystyle 3 \lambda$
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